[This unedited press release is made available courtesy of Gamasutra and its partnership with notable game PR-related resource GamesPress.]

The Arena, which is a post-apocalyptic version of
the survival mode, will be available for everyone after
finishing the story mode. The player has to survive waves of
enemies, complete stages of the arena and perform special tasks
which will be awarded with achievements.

The new mode will consist of encounters divided into smaller
waves and mini-boss fights. Additionally, DLC will contain tougher
challenges in the form of Boss fights. Between the battles
players will be able to purchase weapons and ammunition using
currency they earned on the Arena.

Dirty Arena will be a free DLC available exclusively on Steam.
It will be released as a game update that will also include
previously announced achievements and Cloud integration.